Stop bundling node-pre-gyp to allow for upgrades (#759)
Stop bundling node-pre-gyp to allow for upgrades (#759)

- The latest and greatest recommendation from node-pre-gyp
- Stops issues when people have different node-pre-gyp’s installed already
EmergingTechnologyAdvisors/node-serialport,rhuehn/node-serialport,munyirik/node-serialport,EmergingTechnologyAdvisors/node-serialport,ms-iot/node-serialport,giseburt/node-serialport,voodootikigod/node-serialport,munyirik/node-serialport,ms-iot/node-serialport,node-serialport/node-serialport,node-serialport/node-serialport,giseburt/node-serialport,ms-iot/node-serialport,EmergingTechnologyAdvisors/node-serialport,rhuehn/node-serialport,ms-iot/node-serialport,giseburt/node-serialport,node-serialport/node-serialport,voodootikigod/node-serialport,munyirik/node-serialport,EmergingTechnologyAdvisors/node-serialport,voodootikigod/node-serialport,EmergingTechnologyAdvisors/node-serialport,munyirik/node-serialport,rhuehn/node-serialport,ms-iot/node-serialport,giseburt/node-serialport,voodootikigod/node-serialport,node-serialport/node-serialport,rhuehn/node-serialport,node-serialport/node-serialport